A Robust Strontium Tweezer Apparatus for Quantum Computing

Abstract

Neutral atoms for quantum computing applications show promise in terms of scalability and connectivity. We demonstrate the realization of a versatile apparatus capable of stochastically loading a 5x5 array of optical tweezers with single ${}^{88}$Sr atoms featuring flexible magnetic field control and excellent optical access. A custom-designed oven, spin-flip Zeeman slower, and deflection stage produce a controlled flux of Sr directed to the science chamber. In the science chamber, featuring a vacuum pressure of $3\times 10^{-11}$ mbar, the Sr is cooled using two laser cooling stages, resulting in $\sim 3\times 10^5$ atoms at a temperature of 5(1) $\mu$K. The optical tweezers feature a $1/e^2$ waist of 0.81(2) $\mu$m, and loaded atoms can be imaged with a fidelity of $\sim 0.997$ and a survival probability of $0.99_{-0.02}^{+0.01}$. The atomic array presented here forms the core of a full-stack quantum computing processor targeted for quantum chemistry computational problems.

12 pages, 10 figures

References in corpus (31)

• A variational eigenvalue solver on a quantum processor
• Logical quantum processor based on reconfigurable atom arrays
• An atom-by-atom assembler of defect-free arbitrary 2d atomic arrays
• Quantum computing with neutral atoms
• High-Fidelity Entanglement and Detection of Alkaline-Earth Rydberg Atoms
• Single-atom trapping in holographic 2D arrays of microtraps with arbitrary geometries
• Magnetic field-induced spectroscopy of forbidden optical transitions with application to lattice-based optical atomic clocks
• Alkaline earth atoms in optical tweezers
• Fast machine-learning online optimization of ultra-cold-atom experiments
• Microscopic control and detection of ultracold strontium in optical-tweezer arrays
• A clock with $8\times 10^{-19}$ systematic uncertainty
• Ytterbium nuclear-spin qubits in an optical tweezer array
• 2000-times repeated imaging of strontium atoms in clock-magic tweezer arrays
• Long-lived Bell states in an array of optical clock qubits
• An atomic array optical clock with single-atom readout
• A tweezer array with 6100 highly coherent atomic qubits
• Tweezer-programmable 2D quantum walks in a Hubbard-regime lattice
• Lifetime measurement of the ^3P_2 metastable state of strontium atoms
• A compact and efficient strontium oven for laser-cooling experiments
• Continuous operation of a coherent 3,000-qubit system
• Effusive Atomic Oven Nozzle Design Using an Aligned Microcapillary Array
• A steady-state magneto-optical trap with 100 fold improved phase-space density
• Narrow-line imaging of single strontium atoms in shallow optical tweezers
• Fast and dense magneto-optical traps for Strontium
• Pulse based Variational Quantum Optimal Control for hybrid quantum computing
• Nonperturbative and perturbative treatments of parametric heating in atom traps
• Motional ground-state cooling of single atoms in state-dependent optical tweezers
• Active stabilization of kilogauss magnetic fields to the ppm level for magnetoassociation on ultranarrow Feshbach resonances
• Variational simulation of the Lipkin-Meshkov-Glick model on a neutral atom quantum computer
• Realization of a fast triple-magic all-optical qutrit in strontium-88
• Single Sr Atoms in Optical Tweezer Arrays for Quantum Simulation